Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Narrative)

v3.23.3
Commitments and Contingencies (Details Narrative) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2003
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Self-insured retention       $ 100,000    
Accounts receivable, after allowance for credit loss, current   $ 15,342,000   15,342,000   $ 9,364,000
Restricted cash, noncurrent   11,926,000   11,926,000   11,570,000
Interest income   146,000 $ 29,000 445,000 $ 69,000  
Letters of credit outstanding, amount   3,200,000   3,200,000    
Bond outstanding   36,428,000   36,428,000    
American International Group, Inc [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Period of finite risk insurance policy 25 years          
Maximum allowable coverage of insurance policy   28,177,000   28,177,000    
Coverage amount under the policy   22,461,000   22,461,000    
Interest income   $ 146,000 $ 29,000 $ 356,000 $ 69,000  
Insurers obligation to entity on termination of contract   100.00%   100.00%    
American International Group, Inc [Member] | 2003 Closure Policy [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Restricted cash, noncurrent   $ 11,926,000   $ 11,926,000   11,570,000
Interest income       2,455,000   $ 2,099,000
Canadian Nuclear Laboratories LTD [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Unpaid receivables   2,287,000   2,287,000    
Accounts receivable, after allowance for credit loss, current   $ 1,056,000   $ 1,056,000